Mixing valve for dispensers

ABSTRACT

A tilt action mixing valve having a tiltable valve stem with an upper hollow portion and a side opening at a midway point, constituting a discharge passage. Below the side opening is a valve shoulder, engageable with an annular valve seat through which the hollow stem portion extends, for the purpose of shutting off the flow from within a tubular valve housing to the top of which the annular seat is sealed. The valve housing has two inlet openings, and is mounted at the top of a rigid outer container whose interior communicates with one of said openings. At its bottom the valve housing has the other opening, which communicates with a flexible, collapsible inner container having a different liquid from the outer container. At its inner end the said other opening has a valve seat, in the bottom housing wall, which is engaged by the bottom, solid end of the valve stem to control flow from the inner container into the housing. Tilting of the valve stem permits such flow. Surrounding the valve shoulder of the stem is a flexible seal skirt or cylinder constituting part of the housing. With the stem not tilted, this skirt seals to the shoulder and isolates the two inlet openings from each other. Tilting of the stem unseats both the stem shoulder and the stem bottom, and unseals the skirt from the shoulder. Pressurized liquid then flows from the two containers into the valve housing and out through the upper hollow portion of the stem, with mixing occurring only within the stem hollow portion. There is no mixing chamber as such, within the valve housing, and therefore no mixed residue remains, after a discharge, within the valve housing.

United States Patent Steiman 51 Mar. 7, 1972 [54] MIXING VALVE FORDISPENSERS Woli Steirnan, Fairfield, Conn.

[73] Assignee: VCA Corporation, Greenwich, Conn.

[22] Filed: Oct. 28, 1970 [21] Appl. No.2 84,840

[72] Inventor:

[52] US. Cl.... [51] Int. Cl [58] Field of Search PrimaryExaminer-Samuel F. Coleman Assistant Examiner-Norman L. Stack, Jr.Attmey-H. Gibner Lehmann [57] ABSTRACT upper hollow portion and a sideopening at a midway point, constituting a discharge passage. Below theside opening is a valve shoulder, engageable with an annular valve seatthrough which the hollow stem portion extends, for the purpose ofshutting off the flow from within a tubular valve housing to the top ofwhich the annular seat is sealed. The valve housing has two inletopenings, and is mounted at the top of a rigid outer container whoseinterior communicates with one of said openings. At its bottom the valvehousing has the other opening, which communicates with a flexible,collapsible inner container having a different liquid from the outercontainer. At its inner end the said other opening has a valve seat, inthe bottom housing wall, which is engaged by the bottom, solid end ofthe valve stem to control flow from the inner container into thehousing. Tilting of the valve stem permits such flow. Surrounding thevalve shoulder of the stem is a flexible seal skirt or cylinderconstituting part of the housing. With the stem not tilted, this skirtseals to the shoulder and isolates the two inlet openings from eachother. Tilting of the stern unseats both the stem shoulder and the stembottom, and unseals the skirt from the shoulder. Pressurized liquid thenflows from the two containers into the valve housing and out through theupper hollow portion of the stem, with mixing occurring only within thestem hollow portion. There is no mixing chamber as such, within thevalve housing, and therefore no mixed residue remains, after adischarge, within the valve housing.

A tilt action mixing valve having a tiltable valve stem with an 7Claims, 10 Drawing Figum li 30 r: l 52 8 49 50 68 40 34 24 l 36 I 2 l 70I 1 48 46 1' Zl 32 39 59 t! 5 38 22 62 i so ii I [e l l MIXING VALVE FORDISPENSERS CROSS REFERENCE TO RELATED APPLICATIONS l. Copendingapplication of Wolf Steiman, Ser. No. 843,906, filed June 30, 1969,entitled Tilt Slide Action Aerosol Valve, and having the same ownershipas the present application.

2. Copending application of Wolf Steiman, Ser. No. 44,760, filed June 9,I970, entitled Tilt Action Mixing Dispenser Valve", and having the sameownership as the present application.

BACKGROUND This invention relates to mixing type dispensing valves, andmore particularly to tilt valves wherein a hollow valve stem carrying adischarge fitting is tiltably mounted in a valve housing to control thedischarge of multiple pressurized substances from the dispenser.

Heretofore valves of this type employed return springs, or elseespecially arranged spring-charged parts or molded resilient plasticvalve or housing parts to effect the return or closing of the valve whenthe discharge was to be terminated. This meant additional componentswith consequent increased part and assembly costs, or else moreexpensive molds and more complicated plastic shapes which were likely tomalfunction. Prior valves as a consequence could be unreliable, orunnecessarily high in relative cost or both, as well as being subject tocontamination and the like. In prior valves, also,

'there always existed a mixing chamber, and this constituted a drawbacksince a residue mixture would remain in the valve housing after eachdischarge, diluting and interfering with the proper initial action ofthe dispenser upon the occasion of the next discharge.

SUMMARY The above drawbacks and disadvantages of prior tilting typemixing valves are obviated by the present invention, one object beingthe provision of an improved tilt-type mixing valve which isself-closing or returning without requiring the use of return coilsprings, or the use of especially arranged resilient plastic parts suchas valve or valve-housing members, and which also eliminates entirelythe mixing chamber that was heretofore always necessary. This isaccomplished by the provision of a simple cuplike housing which isclosed or covered by a resilient annular valve seat, and a cooperableshouldered valve stem which is engageable with the valve seat and whichalso has a slidably engageable valving projection engageable with anannular apertured valve seat in an opposite or bottom wall of thehousing, the arrangement being such that the stern can be tilted due notonly to the slide action but also to the capability of the shoulder tocompress a localized area of the seat as a consequence of the tilting,and the capability of the opposite valve-seated bottom wall of thehousing to flex or fulcrum about a rigid embracing cup which surroundsthe housing. During the tilting, another part of the valve shoulderseparates from the top seat to permit the discharge flow, whilesimultaneously the valving projection of the valve part separates fromthe seat of the opposite housing wall to permit inflow into the housing.The resilience of the valve seat and of the bottom housing wall thusprovides for the return movement of the valve after the tilting force isremoved therefrom, making unnecessary the conventional valve return coilspring, or the not so conventional special valve and valvehousingconfiguration heretofore relied on for this purpose. Additionally thevalve housing has an upstanding sealing skirt which is engageable withthe periphery of the shoulder on the valve stem, thereby to isolate twointerior areas or chambers of the valve housing, with the result thatthe housing no longer provides a mixing chamber. Tilting of the valvestem enables a bypass to occur between the skirt and the valve shoulder,either by the use of ribs in the skirt or else by apertures in theshoulder which normally are closed by the resilient annular valve seatfor the untilted valve position.

Other objects and advantages of the invention reside in the provision ofan improved tilt-type dual valve as above set forth, wherein thecomponents are particularly few and simple, inexpensive to produce andassemble, and wherein the multiple-valve action is especially easy aswell as reliable.

Still other features and advantages will hereinafter appear.

In the drawings illustrating three different embodiments of theinvention:

FIG. 1 is a fragmentary axial sectional view of the upper portion of ahand-held dispenser of the pressurized can type with plural containers,having incorporated in it the improved tilt slide action mixing valveand no mixing chamber as such. The valve is shown in its closedcondition.

FIG. 2 is a view like that of FIG. 1, but inverted and showing the valvetilted and in the process of mixing and discharging liquid substances.

FIG. 3 is a top plan view on a reduced scale, of the valve housing.

FIG. 4 is a top plan view of the tiltable valve stem of FIGS. 1-3.

FIG. 5 is an axial sectional view like that of FIG. 1 but illustratinganother embodiment of the invention, incorporating a ribbed sealingskirt in the valve housing.

FIG. 6 is a transverse section taken on the line 6-6 of FIG. 5.

FIG. 7 is an axial sectional view like that of FIG. 5 but showing thevalve in the tilted, discharging position.

FIG. 8 is an axial sectional view like that of FIGS. 1 and 5 butillustrating still another embodiment of the invention.

FIG. 9 is a transverse sectional view taken on the line 9-9 of FIG. 8.

FIG. I0 is a fragmentary axial sectional view of the valve assemblage ofFIG. 8 but showing the valve stem tilted and in the dischargingposition.

Considering first FIGS. 1 and 2, the multiple-fluid dispenser andimproved no mixing chamber valve construction shown therein comprises aconventional pressurized can 20 provided at its upper end with a metalmounting cup 22, including a raised central inverted cup portion 24adapted to carry the discharge valve assemblage and discharge tube.

In conjunction with the above there is provided a tilt slide action dualvalve assemblage which is mounted in the cup portion 24, said assemblagehaving an absolute minimum number of parts of especially simpleconfiguration whereby the component and assembly costs are especiallylow while at the same time there is had a dual-valve actioncharacterized by a desirable ease and reliability of operation. Thevalve construction may mount a conventional resilient molded plasticdischarge tube (not shown) which may be of a well-known type including ayieldable circular base or shield, said tube being carried by the hollowshank portion 28 of a multiple-valve stern member 30 shortly to bedescribed.

As shown in the figures, in accordance with the invention the valveconstruction comprises essentially two simple molded plastic parts, thevalve stem part 30 and a novel valvehousing part 32 together with aresilient, rubber washerlike valve seat 34. The novel valve housing 32is molded of a suitable plastic substance which has appreciableresilience, such as Polyethylene of known formulation. The valve stem 30is of rigid plastic substance, being molded of a material knowncommercially as Delrin.

The housing 32 has a cuplike body portion 35 providing an annularchamber 36 for receiving liquid from the container 20 through a wallopening 21, said body including a transverse wall 38 which defines oneside (the bottom) of the chamber. The valve seat 34, being resilient andconstituted of rubber or rubberlike material, is apertured to receivethe hollow shank portion 28 of the valve stem 30. The valve seat 34constitutes an upper side of the chamber 36, being clamped against theannular rim portion of the valve housing by the top wall 42 of themounting cup portion 24.

The valve housing 32 has an annular outer ledge or shoulder 44 againstwhich sidewall portions of the mounting cup are crimped as indicated at46, thereby to retain the valve housing in its operative position withthe rim portion 40 tightly sealed against the valve seat 34.

In accordance with this invention the valve stem 30 includes an annularvalve shoulder 48 having a plurality of apertures 49, said shoulderbeing disposed adjacent the liquid-receiving chamber 36 of the housing32 and being engageable with the resilient valve seat 34 to close theaperture thereof. The valve stem or part 30 also has a transverse orside passage 50 disposed adjacent the valve shoulder 48 andcommunicating with the hollow or bore 52 of the shank 28 by means of athrottling or metering aperture 54.

The valve part 30 further has a depending valving abutment portion 56including a bulbous slide valving surface 58 which is engageable withand slidable on a recessed annular valve seat 59 including a passage 61in the upper portion of the transverse wall 38 of the valve housing whenthe valve part is upright or is not being tilted. The portion 24 of themounting cup 22 is apertured to provide appreciable clearance for and toadmit the shank 28 of the valve part 30. The abutment portion 56, 58 ofthe valve part 30 preferably supports said part in the normally closedposition of FIG. 1 wherein the valve shoulder 48 is engaged with thevalve seat 34, thereby preventing egress of liquid from the chamber 36through the hollow shank 28, and wherein the valving portion 56, 58closes or stoppers the valve seat 59.

The valve housing 32 has a depending hollow boss 60 depending from thetransverse wall 38, to which there is affixed a collar 62 of a flexibleand collapsible inner container 63 disposed in the outer container 20 asshown.

The offset inlet opening 21 provided in the transverse wall 38 iseccentrically and externally located with respect to the boss 60 and thebore thereof whereby it is normally not only out of alignment with thevalving abutment portion 56 of the valve part 30 as seen in FIG. 1 butcan be effectively isolated therefrom as will be shortly brought out.With such construc tion, pressurized liquid in the container 20 cannormally occupy the chamber 36 of the valve housing when the dispenseris inverted as seen in FIG. 2, reaching said chamber through the offsetinlet opening 21 Referring to FIG. 1, the side opening or transversepassage 50 of the valve part 30 is spaced upward a slight extent fromthe top or sealing face 66 of the valve shoulder 48, said passageextending completely through the stem and being preferably of square orrectangular cross-sectional configuration. The passage 50 communicateswith an annular external groove 68 which is also spaced slightly abovethe top surface 66 of the valve shoulder 48. Such spacing provides for amore effective and leakproof closing of the valve. The throttlingaperture 54 communicates with the transverse passage 50 wherebycommunication is established between the bore 52 of the shank portion 28of the valve stem and the annular groove 68 thereof.

The bottom 58 of the nonyielding abutment portion 56 of the valve stemcomprises the second valve of the assemblage and constitutes a slidesurface or bulbous terminus which is engageable with the bottom valveseat 59 of the valve housing 32 and can effectively close off thepassage 61 leading from the container 63 when the stem 30 is not tilted.The housing wall 38 is resilient and firmly affixed to the sidewalls 44which are backed up by the annular cup wall 24 at points closelyadjacent the wall 38. Thus the wall 38, in yielding to force from thevalve 58 as the stem 30 tilts, flexes and fulcrums about the crimpedportions 46 which are nonyielding. This action replaces the usual coilspring return of conventional springtype valves, and is effective inenabling tilting of the stem for discharge, and in restoring the stem tothe valve-closing position of FIG. 1.

By the present invention the housing 32 has no mixing chamber. It is,for this purpose, provided with an upstanding integral resilient skirt70 which sealingly engages the periphery of the stem shoulder 48 whenthe stem 30 is upright as in FIG. 1. The skirt 70 thus isolates thechamber 36 from an inner chamber 72 as formed by the skirt 70. Theplurality of apertures 48 of the shoulder 48 are normally sealed by theannular seat 34 for the nondischarge position of FIG. 1. The chamber 72,if it contains any residue liquid after a discharge has occurred, willcontain only liquid from the container 63, which liquid has entered thechamber 72 through the passage 61. Such residue liquid will be trapped,since the valve 56, S8 is closed and the apertures 49 are closed.Isolation exists between this trapped liquid in chamber 72 and theliquid in chamber 36, due to the seal effected by the resilient skirt 70engaged with the valve shoulder 48.

The operation of the improved, simplified tilt slide action dual valveof the invention as devoid of a mixing chamber in the valve'housing maynow be readily understood. Considering FIG. 1, the engagement of theabutment valving portion 56 of the valve part 30 with the resilient wall38 of the valvehousing part 32 tends to maintain the valve shoulder 48in engagement with the valve seat 34, and to maintain the apertures 49closed. The pressure within the container 20 tends to maintain the valveshoulder 48 tightly sealingly engaged with the valve seat 34. And theforce of the valving abutment 58 against the valve seat 59 seals off theseat, whereby the liquid in the flexible container 63 (under pressurefrom the contents of the container 20) remainsisolated from thepressurized liquid in the container 20. As a consequence, no mixing ofthe liquids nor any discharge will normally occur, nor any leakage whenthe valve part 30 is in the nontilted or vertical position of FIG. 1.When it is desired to mix and discharge the contents of the containers20 and 63, the valve stem 30 is tilted as by applying finger pressure tothe discharge stem 28 as illustrated in FIG. 2. This will cause thevalve shoulder 48 to compress a localized area of the valve seat 34 andflex downward the housing wall 38 as in FIG. 2, and will cause anotherpart of the valve shoulder 48 to separate from the seat 34 at locationsopposite to the localized indented portion of the seat, as well asclearing or opening some of the apertures 48 and also effectingseparation of the valve 58 from the seat 59. Communication will thus beestablished between the chamber 36 and the bore 52 of the valve stem, bymeans of the annular groove 68 and transverse passage 50 as well as thethrottling passage 54. Also, flow will occur into the chamber 36 fromthe container 20 through the inlet 21, and into the chamber 72 from thecontainer 63 through the inlet 61. A mixing will occur in the bore 52 ofthe valve stem, and the mixture will be discharged from the mouth of thestem 28. This discharge will be constituted of liquids which have flowedthrough some of the openings 49 after having entered the chamber 72 viathe center passage 61 from the container 63, and liquids from thecontainer 20 via the passage 21 and chamber 36. The mixing occursdownstream of the valve 34, 48, and thus a residue mixture is nevertrapped in the valve housing 32 to impair future discharges. Duringtilting of the valve part 30 the abutment valving portion 56, 58 thereofwill have slid along the top of the transverse wall 38 of the valvehousing 32 and out of the valve seat 59, such sliding movement beingfacilitated by the resilience of the wall 38. Upon release of fingerpressure, the tendency for the valve seat 34 to resume its normal,noncompressed condition will restore the valve stem part 30 to thevertical, sealing position of FIG. I. By virtue of the provision of theannular groove 68 and the spacing of said groove and the passage 50slightly above the top surface 66 of the valve shoulder 48 there isinsured not only a reliable discharge regardless of the direction inwhich the valve stem is tilted but also a reliable shutoff of the flowwithout leakage when tilting finger force is removed from the sprayhead. Ribs 39 at the underside of the wall 38 prevent the collar 62 ofthe container 63 from closing off the inlet 21, which is thereby ineffect recessed in the wall 38.

In the following description of other embodiments of the invention,parts which are similar but not identical to those already describedhave been given similar characters but with the suffixes a or b attachedto them.

Another embodiment of the invention is illustrated in FIGS. 5, 6 and 7.This embodiment differs from that of FIGS. 1-4 in that the valveshoulder of the tiltable valve stem is devoid of apertures such as theapertures 74 seen in FIG. 4, and instead the isolating resilient skirtwithin the valve housing is provided with axially extended ribs toprovide a bypass in the absence of the apertures in the valve shoulder.

In FIGS. 5-7 parts similar to those already described have been givensimilar numerals or characters. The assemblage includes a tiltable valvestem 300 having a discharge passage 52a and having a valving shoulder48a. The stem 38a has a depending portion 56a which is cooperable with avalve seat 59a of the valve housing 32a. The chamber 36a in the valvehousing 32a is isolated by an upstanding resilient skirt 70a providedwith a plurality of axially extending inwardly disposed ribs 78 whichmeet an annular internal bead 80 at the top edge or rim portion of theskirt 70a. The bead 80 effects sealing engagement with the periphery ofthe valve shoulder 48a. The ribs 78 also engage the peripheral surfaceof the valve shoulder 48a and function to constitute a stiffening meansfor the skirt and to provide clearance space constituting a bypasspassage.

Considering FIG. 7, when the valve stem 30a is tilted, the peripheralportion of the valving shoulder 48a will engage the internal ribs 78,and will distort the resilient skirt 70a in the manner indicated andestablish clearance at the ribs. Accordingly, flow will be establishedfrom the chamber 724 past the valve shoulder 48a to the groove 68a ofthe valve stem. Otherwise, in general the functioning of the embodimentof FIGS. 5-7 is similar to that already described in connection withFIGS. 1-4.

Yet another embodiment of the invention is illustrated in FIGS. 8-10.Similar parts have been given similar characters, as with the previousembodiment. In FIGS. 810 the valve stem 30a is cooperable with a valvehousing 32b which is provided with an integral upstanding resilientsealing skirt 70b having a plurality of internal axially extended ribs78b. Normally, the upper ends of the ribs 78b engage the bottomperipheral edge portion of the valve shoulder 48a, as seen in FIG. 8,tending to maintain the valve stem 30a in the upright, closed conditionor position. However, when the stern 30a is tilted as seen in FIG. 10 toeffect a discharge, the valve shoulder 48a will engage and cam outwardone or several of the ribs 78b distorting the sealing skirt 70b andeffecting bypass discharge passages whereby liquid can pass from thechamber 72a to the annular groove 68a of the tilted valve stem 30a. Theshort ribs 78b not only stiffen the skirt 70b but also tend to returnthe valve stem 30a to the vertical nondischarging position by virtue ofthe pressure they exert on the valve shoulder 4811.

It will now be understood from the foregoing that I have provided anovel and improved tilt and slide action dual valve assemblage whereinthe valve housing is devoid of a mixing chamber which could collectundesired mixed liquid residue, and wherein there are the fewestpossible components, said components being of simple construction andbeing readily produced at a low cost. The components may be assembledwithout difficulty, utilizing automatic feeds and the like in assemblingmachines, and no special orientation of the valve stem with respect tothe remainder of the parts is required during assembly, since thedirection of tilt to effect a discharge is not critical. It will beespecially noted that no valve return coil inasmuch as the inlet passage21 is offset or eccentrically located.

Variations and modifications are possible without departing from thespirit of the invention.

I claim:

1. A mixing valve construction for a dispenser of the type having twocontainers for two different liquids respectively,

comprising in combination:

a. a valve housing having a pair of chambers open at their tops andadapted for respectively receiving liquids from several containers, andhaving a bottom wall common to said chambers, said bottom wall having anannular valve seat,

. a resilient, annular valve seat constituting the top walls of saidchambers,

c. a valve part having a hollow shank portion extending through anaperture in said resilient valve seat,

d. said valve part having an annular valve shoulder disposed in onechamber of the valve housing and arranged for engagement with theresilient valve seat to close the aperture thereof,

e. said valve part having a side passage disposed adjacent the valveshoulder and communicating with the hollow of the shank portion, saidvalve part further having a depending valving portion engageable withand slidable over the annular valve seat of the bottom wall of the valvehousing when the valve part is tilted, thereby to either close or opensaid bottom wall valve seat, said valve housing having in it anupstanding resilient annular skirt carried by the bottom wall thereofand at its top engaging and sealing with the periphery of said valveshoulder, said skirt constituting a partition between said chambers andthereby isolating the chambers from each other,

g. means providing a bypass passage from the chamber within said skirtthrough said valve shoulder when the valve part is tilted,

h. tilting of the valve part unseating both the depending valvingportions thereof and the shoulder thereof respectively from the bottomwall valve seat and the top valve seat of the housing and shifting thevalve shoulder on the upstanding skirt whereby liquids from both thechambers can flow into the hollow shank portion through the said sidepassage.

2. A valve construction as in claim 1, wherein:

a. the valve housing has a hollow boss depending from the valve seat ofsaid transverse bottom wall, and

b. a container connected to said hollow boss, for supplying liquid tothe chamber of the valve housing.

3. A valve construction as in claim 2, wherein:

a. the valve housing has an opening in a wall thereof, and

b. a second container surrounding the valve housing and communicatingwith one of the chambers thereof through said opening. I

4. A valve construction as in claim 1, wherein:

a. the means providing the bypass passage comprises apertures in thevalving shoulder,

b. said apertures normally being closed by said resilient valve seatwhen the valve part is not tilted.

5. A valve construction as in claim 1, wherein:

a. the means providing the bypass passage comprises ribs on the interiorof the resilient upstanding skirt, effecting a spacing of skirt portionsfrom the valving shoulder when the valve part is tilted.

6. A valve construction as in claim 5, wherein:

a. the ribs of the skirt terminate short of the upper rim of the skirt.

7. A valve construction as in claim 5, wherein:

a. the resilient skirt has an internal bead on its upper rim, connectedwith the ribs of the skirt and engaging the periphery of the valvingshoulder.

1. A mixing valve construction for a dispenser of the type having twocontainers for two different liquids respectively, comprising incombination: a. a valve housing having a pair of chambers open at theirtops and adapted for respectively receiving liquids from severalcontainers, and having a bottom wall common to said chambers, saidbottom wall having an annular valve seat, b. a resilient, annular valveseat constituting the top walls of said chambers, c. a valve part havinga hollow shank portion extending through an aperture in said resilientvalve seat, d. said valve part having an annular valve shoulder disposedin one chamber of the valve housing and arranged for engagement with theresilient valve seat to close the aperture thereof, e. said valve parthaving a side passage disposed adjacent the valve shoulder andcommunicating with the hollow of the shank portion, said valve partfurther having a depending valving portion eNgageable with and slidableover the annular valve seat of the bottom wall of the valve housing whenthe valve part is tilted, thereby to either close or open said bottomwall valve seat, f. said valve housing having in it an upstandingresilient annular skirt carried by the bottom wall thereof and at itstop engaging and sealing with the periphery of said valve shoulder, saidskirt constituting a partition between said chambers and therebyisolating the chambers from each other, g. means providing a bypasspassage from the chamber within said skirt through said valve shoulderwhen the valve part is tilted, h. tilting of the valve part unseatingboth the depending valving portions thereof and the shoulder thereofrespectively from the bottom wall valve seat and the top valve seat ofthe housing and shifting the valve shoulder on the upstanding skirtwhereby liquids from both the chambers can flow into the hollow shankportion through the said side passage.
 2. A valve construction as inclaim 1, wherein: a. the valve housing has a hollow boss depending fromthe valve seat of said transverse bottom wall, and b. a containerconnected to said hollow boss, for supplying liquid to the chamber ofthe valve housing.
 3. A valve construction as in claim 2, wherein: a.the valve housing has an opening in a wall thereof, and b. a secondcontainer surrounding the valve housing and communicating with one ofthe chambers thereof through said opening.
 4. A valve construction as inclaim 1, wherein: a. the means providing the bypass passage comprisesapertures in the valving shoulder, b. said apertures normally beingclosed by said resilient valve seat when the valve part is not tilted.5. A valve construction as in claim 1, wherein: a. the means providingthe bypass passage comprises ribs on the interior of the resilientupstanding skirt, effecting a spacing of skirt portions from the valvingshoulder when the valve part is tilted.
 6. A valve construction as inclaim 5, wherein: a. the ribs of the skirt terminate short of the upperrim of the skirt.
 7. A valve construction as in claim 5, wherein: a. theresilient skirt has an internal bead on its upper rim, connected withthe ribs of the skirt and engaging the periphery of the valvingshoulder.